全文获取类型
收费全文 | 2083篇 |
免费 | 143篇 |
出版年
2024年 | 4篇 |
2023年 | 18篇 |
2022年 | 38篇 |
2021年 | 74篇 |
2020年 | 50篇 |
2019年 | 57篇 |
2018年 | 64篇 |
2017年 | 56篇 |
2016年 | 94篇 |
2015年 | 119篇 |
2014年 | 118篇 |
2013年 | 175篇 |
2012年 | 147篇 |
2011年 | 160篇 |
2010年 | 102篇 |
2009年 | 97篇 |
2008年 | 116篇 |
2007年 | 115篇 |
2006年 | 94篇 |
2005年 | 82篇 |
2004年 | 54篇 |
2003年 | 54篇 |
2002年 | 47篇 |
2001年 | 42篇 |
2000年 | 33篇 |
1999年 | 33篇 |
1998年 | 15篇 |
1997年 | 6篇 |
1996年 | 10篇 |
1995年 | 9篇 |
1994年 | 10篇 |
1993年 | 9篇 |
1992年 | 15篇 |
1991年 | 5篇 |
1990年 | 9篇 |
1989年 | 13篇 |
1988年 | 6篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 9篇 |
1983年 | 6篇 |
1981年 | 6篇 |
1979年 | 6篇 |
1978年 | 7篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1975年 | 6篇 |
1974年 | 6篇 |
1973年 | 2篇 |
1972年 | 3篇 |
排序方式: 共有2226条查询结果,搜索用时 15 毫秒
31.
Fernando Sequeira Adam Bessa‐Silva Pedro Tarroso Tiago Sousa‐Neves Marcelo Vallinoto Helena Gonalves Iigo Martínez‐Solano 《Journal of evolutionary biology》2020,33(2):202-216
The study of natural hybrid zones can illuminate aspects of lineage divergence and speciation in morphologically cryptic taxa. We studied a hybrid zone between two highly divergent but morphologically similar lineages (south‐western and south‐eastern) of the Iberian endemic Bosca's newt (Lissotriton boscai) in SW Iberia with a multilocus dataset (microsatellites, nuclear and mitochondrial genes). STRUCTURE and NEWHYBRIDS analyses retrieved few admixed individuals, which classified as backcrosses involving parental individuals of the south‐western lineage. Our results show asymmetric introgression of mtDNA beyond the contact from this lineage into the south‐eastern lineage. Analysis of nongeographic introgression patterns revealed asymmetries in the direction of introgression, but except for mtDNA, we did not find evidence for nonconcordant introgression patterns across nuclear loci. Analysis of a 150‐km transect across the hybrid zone showed broadly coincident cline widths (ca. 3.2–27.9 km), and concordant cline centres across all markers, except for mtDNA that is displaced ca. 60 km northward. Results from ecological niche modelling show that the hybrid zone is in a climatically homogenous area with suitable habitat for the species, suggesting that contact between the two lineages is unlikely to occur further south as their distributions are currently separated by an extensive area of unfavourable habitat. Taken together, our findings suggest the genetic structure of this hybrid zone results from the interplay of historical (biogeographic) and population‐level processes. The narrowness and coincidence of genetic clines can be explained by weak selection against hybrids and reflect a degree of reproductive isolation that is consistent with cryptic speciation. 相似文献
32.
33.
Márcio A. de Sousa Gabriela Rabaioli Rama Claucia F. Volken de Souza Camille E. Granada 《Biotechnology progress》2020,36(2):e2937
The genus Lactobacillus has been widely used in food industry as starter or adjunct culture due to its probiotic features. Its biotechnological features improve the spectrum of uses of lactobacilli, which can affect its applicability directly. In this sense, this literature review gathers information and discusses the biotechnological potential of technological/probiotic lactobacilli aiming to improve food quality and human health. The primary and secondary metabolism generates specific substances, such as organic acids, carbon dioxide, hydrogen peroxide, diacetyl, fatty acids, and bacteriocins, which are determinant due to their probiotic potential, antimicrobial activity, and the development of new food flavors. In order to become industrially and commercially attractive, it is necessary develop a large-scale process with lower production costs. 相似文献
34.
Reis Ricardo Souza Vale Ellen Moura Sousa Kariane Rodrigues Santa-Catarina Claudete Silveira Vanildo 《Plant Cell, Tissue and Organ Culture》2021,145(1):101-115
Plant Cell, Tissue and Organ Culture (PCTOC) - Several factors influence culture conditions and somatic embryogenesis responses, such as the role of plant growth regulators (PGRs) during the... 相似文献
35.
dos Santos Fernanda Marcelia Pflüger Pricila Fernandes Lazzarotto Leticia Uczay Mariana de Aguida Wesley Roberto da Silva Lisiane Santos Boaretto Fernanda Brião Menezes de Sousa Jayne Torres Picada Jaqueline Nascimento da Silva Torres Iraci Lucena Pereira Patrícia 《Neurochemical research》2021,46(8):2066-2078
Neurochemical Research - Gamma-decanolactone (GD) has been shown to reduce epileptic behavior in different models, inflammatory decreasing, oxidative stress, and genotoxic parameters. This study... 相似文献
36.
da Silva Fernando Henrique Alves de Morais Patrícia Lígia Dantas da Silva Dias Nildo de Sousa Nunes Glauber Henrique de Morais Marciana Bizerra Melo Marlenildo Ferreira de Albuquerque Nascimento Maria Tereza 《Journal of Plant Growth Regulation》2021,40(3):1298-1314
Journal of Plant Growth Regulation - This study evaluated the effect of saline water irrigation (4.5 dS m−1) on growth, gas exchange and mineral nutrient content in eight melon accessions and... 相似文献
37.
de Sousa Sylvia Morais de Oliveira Christiane Abreu Andrade Daniele Luiz de Carvalho Chainheny Gomes Ribeiro Vitória Palhares Pastina Maria Marta Marriel Ivanildo Evódio de Paula Lana Ubiraci Gomes Gomes Eliane Aparecida 《Journal of Plant Growth Regulation》2021,40(2):867-877
Journal of Plant Growth Regulation - The rising demand for agricultural commodities in developing countries has put increasing pressure on land resources for higher yields, with associated growth... 相似文献
38.
39.
de Sousa Karolini Tenffen Deniz Matheus Moro Matheus Fernando Gomes Isabelle Cordova do Vale Marcos Martinez Dittrich João Ricardo 《International journal of biometeorology》2021,65(10):1781-1786
International Journal of Biometeorology - Lying behavior is an important indicator of the cows’ welfare and health. In this study, we evaluate the effect of the physical environment on dairy... 相似文献
40.
Olívia Moraes Ruberti Andressa Silva Sousa Laís Rosa Viana Moiss Felipe Pereira Gomes Alessandra Medeiros Maria Cristina Cintra Gomes Marcondes Luciano de Figueiredo Borges Carlos Cesar Crestani Cristiano Mostarda Telma Ftima da Cunha Moraes Rafael Renatino Canevarolo Maria Andreia Delbin Bruno Rodrigues 《Journal of cellular physiology》2021,236(2):1105-1115
This study aimed to evaluate the impact of aerobic training (AT) on autonomic, cardiometabolic, ubiquitin‐proteasome activity, and inflammatory changes evoked by myocardial infarction (MI) in ovariectomized rats. Female Wistar rats were ovariectomized and divided into four groups: sedentary + sham (SS), sedentary + MI (SI), AT + sham surgery (TS), AT + MI (TI). AT was performed on a treadmill for 8 weeks before MI. Infarcted rats previously subjected to AT presented improved physical capacity, increased interleukin‐10, and decreased pro‐inflammatory cytokines. Metabolomic analysis identified and quantified 62 metabolites, 9 were considered significant by the Vip Score. SS, SI, and TS groups presented distinct metabolic profiles; however, TI could not be distinguished from the SS group. MI dramatically increased levels of dimethylamine, and AT prevented this response. Our findings suggest that AT may be useful in preventing the negative changes in functional, inflammatory, and metabolic parameters related to MI in ovariectomized rats. 相似文献